multicarriageway

A multicarriageway is a road or highway that is divided into two or more separate roadways, typically for traffic traveling in opposite directions. These separate roadways are known as carriageways or traffic lanes. The division between carriageways is usually achieved by a physical barrier, such as a median strip, central reservation, or guardrail. This separation is a key feature of roads designed for high-speed and high-volume traffic, as it significantly reduces the risk of head-on collisions.

Multicarriageways are common in modern road construction and are found in various forms, including dual carriageways, motorways, and expressways. A dual carriageway is a simple form where traffic flowing in opposite directions is separated by a median. Motorways and expressways are typically more complex multicarriageways, often featuring multiple lanes in each direction, limited access points, and grade-separated intersections. The primary purpose of a multicarriageway design is to improve traffic flow, enhance safety by preventing opposing traffic from crossing paths, and accommodate a larger volume of vehicles. The design aims to segregate different types of traffic and manage speeds effectively.